Air rifles generally perform(accuracy) best when you keep the Muzzle Velocity between 800fps and 950fps. You do that by matching pellet weight to the power of your rifle. So for those rifles you're looking at 7.5gr to 10.6gr pellets. If the MV is too slow the trajectory suffers and when it's too fast, accuracy does.

Both of the rifles you're asking about are Chinese built entry level springers(includes gas piston). Quality control with these rifles is generally not good, so, durability, accuracy, etc vary greatly from rifle to rifle.

But, if you get lucky and the one you buy happens to deliver halfway decent accuracy and doesn't fall apart in your hands within the first few weeks. They're a
good way to get your feet wet in the world of airguns.

For a few dollars more you can get a much better rifle
Gamo Hornet($99)**
**Academy Sports or Pyramydair.com